Improvement in the manufacture of rubber-coated parchment-paper



UNITED STATES PATE T OFFICE.

E. P. HUDSON, OF NEW YORK, N. Y., ASSIGNOR TO NEW YORK WATER- PROOFPAPER COMPANY, OF NEW YORK CITY.

IMPROVEMENT IN THE MANUFACTURE OF RUBBER-COATED PARCHMENT-PAPER.

Specification forming part of Letters Patent No. 107,687, datedSeptember 27, 1870.

Be it known-that I, E. P. HUnsoN, of the city, county. and Stateof NewYork, have invented an Improved Vulcanized Material from Paper Body; andI do hereby declare that the followingis a full and exact descriptionthereof.

I take .the material produced by my improved process, for which I havemade application forLetters Patent, and which I will here brieflydescribe.

The paperlunsized) is first dipped in or passed through a bath composedof two volumes of commercial sulphuric acid and one volume of water,kept at a temperature of 60 Fahrenheit. Then, after washing it in clearwater, it is passed through a bath of very dilute aqua ammonia. Again,after washing in water, it is passed through. a bath of very dilutelime-water, and after washing once more in water, and while still wet,it is passed through a bath of glycerine, thus completing the process,and producing a material possessed of the very valuable qualities ofstren gth, pliability, and imperviousness to water; but for uses wherethe material is much or long exposed to water, or to atmosphericchanges, it is desirable to DJEI-kOylIllGlIltttGllEbl more durable andunaffected by those influences.

To produce such a material, I take the material produced by theabove-described process and treat it substantially as follows: A veryliquid solution of india-rubber in benzine or other solvent having beenprepared, the material is immersed therein, and, after recent. of thecaoutchouc used; or a portion of the sulphur may be mixed with theprevious glycerine bath, and, of course, a less quantity is thenrequired in the benzine solution or to be dusted on the materialafterward.

This vulcanizing process may be applied either to single thicknesses ofthe paper material or to united thicknesses. I

What I claim as my invention, and desire to secure by Letters Patent,is-- 1. Treating paper previously subjected to the acid and glycerineprocesses with indiarubber and sulphur, and then to the action of heat,substantially as herein specified.

2. As a new article of manufacture, the material thus produced.

Witnesses:

' J os. BROWN,

EDM. F. BROWN.

E. P. HUDSON.

